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Caffeine is a central nervous system stimulant widely used for its ability to help people wake up, stay alert, maintain energy levels and respond quickly. It is found in a variety of products, including medications and dietary supplements, most sodas, coffee, tea and chocolate.

Once consumed, caffeine quickly enters the bloodstream through the stomach and small intestine. From there, it directly to the central nervous system where it stimulates certain chemicals in the brain that produce an energizing effect on the body. This effect peaks within 30 to 60 minutes of caffeine consumption.

Experts generally agree that, for most people, caffeine does not pose serious health risks when used in moderate amounts. However, people who are highly sensitive to caffeine may experience effects such as increased heart rate, anxiety, the jitters or insomnia. However, this effect only lasts a few hours because caffeine does not accumulate in the body.

For years, researchers have looked for potential links between caffeine use and certain health problems (e.g., cancer, cholesterol levels, ulcers). To date, no scientific evidence has emerged that links caffeine use to any of these disorders, according to the American Dietetic Association.

Nonetheless, people who consume high levels of caffeine may experience effects such as abnormal heart rhythms, headaches, muscle tremors and gastrointestinal problems. Extraordinarily high caffeine intake can lead to serious health consequences, and can even be fatal.